Chat with GLM 5.3 for free
GLM 5.3 is Z.ai's open-weight coding and agentic model, with always-on reasoning and a 1M-token context window for large codebases. Start typing, no sign-up needed.
See how GLM 5.3 thinks
Pick a task and watch a sample answer stream in. Open the same prompt in Chatday when you’re ready.
The bug is in the arrow body: u.id = id assigns instead of compares, so the callback returns the assigned value and .find never matches the way you expect.
Fix it with a strict comparison:
Use === to compare. A single = is assignment, which is why you saw undefined.
What makes GLM 5.3 stand out
GLM 5.3 specifications
| Provider | Z.ai |
| Model family | GLM 5 series |
| Context window | 1,000,000 tokens |
| Max output | 1,000,000 tokens |
| Modality | Text · Code |
| Input price | $1.4 / 1M tokens |
| Output price | $4.4 / 1M tokens |
| Tool / function calling | Yes |
| Vision | No |
| Streaming | Yes |
| Available in Chatday | Free & Pro |
Pricing shown for reference; usage is included in your Chatday plan.
GLM 5.3 vs other top models
| Model | Context | Best at | Input price | In Chatday |
|---|---|---|---|---|
| GLM 5.3 | 1M | Coding agent | $1.4/M | Free |
| GPT-6.1 | 1.1M | Agentic coding | $2/M | Free |
| Grok 4.6 | 500K | Agentic reasoning | $2/M | Free |
| Claude Opus 5 | 1M | Frontier agents | $5/M | Free |
GLM 5.3 questions
Other models
GPT-6.1
GPT-6.1 is OpenAI's newest flagship for agentic coding, computer use and professional work, with a 1M-token context and configurable reasoning.
Grok 4.6
Grok 4.6 is xAI's flagship for long agentic runs, with self-checking on multi-step tasks and strong coding at half frontier prices.
Claude Opus 5
Claude Opus 5 is Anthropic's strongest Opus model: hybrid reasoning for long-running agents, serious coding and computer use.
Chat with GLM 5.3 and switch models any time.
One subscription, every leading model. Start free in the Chatday web app.